Sprinkler base



FIG. 1 is a perspective view of a sprinkler base according to theinvention;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a right side elevational view thereof; and,

FIG. 7 is a bottom plan view thereof.

The ornamental design for a sprinkler base, as shown and described.